Me and my boyfriend were dry humping and he came a little i was wearing thin underwear but with jeans over top and he was wearing boxers and jeans my pants were a little damp can i be pregnant?

Probably not, but... Highly improbable. Think about if you were
trying to have a baby. Is this the best way? I doubt it. You would
want full intercourse, as many times as you could possibly do it.
Picture somebody else trying to get pregnant with their clothes on.
Hello!!!!! That isn't going to cut it.